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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8622d2fb0f8be9f5b334a07d11ac5ac27abb9cd71903cb08642083ad8c9613c3' 
  AND token = 'xKM5OSRrckqjwqY2rygV6tFMHwnMmP0og22DIN+3xNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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