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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ac5be196585c8461b12481c6194302e6ca063cc1aa17ba001c0f39aec7fe6a' 
  AND token = '9wfxbWlpip/mj0Jchi7ALuvrRfppZW1qI+7THs2049Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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