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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e610f5274c7e5f5cd7bb8b234248c4b433d4158a358e73707a40ef68c63f59db' 
  AND token = 'kEyC7Ub7K2V5g+zluLDeF2uzS+XuX85IqURFKO5QhSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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