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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c3e0c5903b7e2f4d4d62743aabbcd933b76e0138f8f27b3e0f3a0b2d1747bdb' 
  AND token = 'wMUUlE0X6WE2XanyZKeTcjGjV9r50pocsQFBJD6HzXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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