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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38ccfc6736186f3233797ba1f2b7e9ea5f7b12fec16b66faee2086e2c101019' 
  AND token = 'M/xk4nF9TYoZsP3TDE5Ac3e9JMKgebCB2MZZ/D4GN6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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