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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b97569c88d9b67610518983356b26e030a843a6de29f333097522be52c8585e' 
  AND token = 'I755gbP6Lrs8KRWVaGoirwX+c1BXnDEmE62yYsS78NA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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