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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552e6cc0d8dfa4b50f3ab8b46957b868e60636bac5838e2d35c97f4cdff64948' 
  AND token = 'F/BNVqi5EcG/q7ZdRLYLA6iWtq8UixUpaQJZkctEPZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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