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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698961268c429575fe9182ecdd5bd9afbde26e07e2c7ad8ae2ce35873e49f79e' 
  AND token = 'v0SiLsiXnT8WafsjdZ2zVmeGqjbNF7tmvLwyrnsq4HI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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