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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '032e1b39a87435efe59a9b4e4771a83de4897140dc99dcb924bac843238e6f53' 
  AND token = '3eSiBCDjUy3ZNPhxZNLh7DQwEw5mndoWStMV6Y8hAa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00089

JSON explain

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