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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccaab39a1559dc517ad9cb3117b86fe5cb19b8920d50f3de7f165aab26f0aa3' 
  AND token = 'ZchaQ+o2YnqJVXyHlbM4C5yrSIwmkbu1hOXkb31aQsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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