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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06ccff232444fc9e55e3bc751ab5d86a2abac1b71d06a53bc1d72f92347a0ae0' 
  AND token = 'Q6UE+odcoXtD8V2TiPJDHQG4h95hO4qJeE77PrXmcwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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