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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db109832bd892e04a0a5000ae8dc9b58189a1299fa20e7bc8ce6ecd9d7499591' 
  AND token = 'xmT4Qe4pLsuqKfv9QlPHL9t1pOuiYvIHJkOJayrun9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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