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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0cdb7f9802a0ee3c17a4f47442040677a9ecfde08622fd1518e766cd322e86d' 
  AND token = '1FyjHVJseoCGGffyR/DitQWkLJdoq53APM2pIwIhxm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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