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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769da9836b12d67e45b51335238204ef39c6f3cacc475389fdcd7d64cedcaffd' 
  AND token = 'Nz/1ytPiC7pf8MCh7a5uN2Fm3yauAPNRbQ33TPeQuxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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