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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89d4d6e2dad3bd9b369328e342b28c072182ef0798b96623c9703db1d72891a' 
  AND token = 'NaOt5CD7zFZaEsizoDKivuHc4KlxtlB8X3sm23a9g/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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