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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd4b532aebd88d529c1f1056ac33194f87dd2fe8559dd7a5a5f3080294d33f7c' 
  AND token = 'CUltsUzSyw+oRGt2Qb4nEfTJ7Fi0wDFV8rYhDiYmSn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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