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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01bdd5e36f2ab5d3183c17902b3dfc5dd6079a0dbf9d1af682122a4d885ffaf' 
  AND token = 'MToNoaq6AXjiIGq4SxzBmAygx6qOuJSOp+2/vgkbzx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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