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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0def976a598c875eaf49f0245aed380df715bb268644041c506a58d03a38546' 
  AND token = 'fs0xMmh2mfHM0muYo1EamFfjbO34WRdQQ9DGVndY35Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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