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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2ad6563d419b5e914224d3c87f3d5ee2cf837c35ef25acd7cb49037ccc5a36d' 
  AND token = 'FjjUoaU2OdhC1RI3JgMY2n6640hDjoDWGSrp8IEvRSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}