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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad87c1f0156fcfbc42f4d0ad4bf356c86c1f550749022407034fbb263d6248a9' 
  AND token = '1Dcr9cvIwS2cwQHJCO37ZGUIJ48FPHfAe5eD3Dla31g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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