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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d9556c0dc1764f02ed8a96afa3c95f128a3857a184011bfce32f16fd92ac33' 
  AND token = 'GhjRiDyblHsNP5ZKgeaELp4Nb1/xheC0FkIwFIOimI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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