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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f196fb8ff2230c247e1ec973c0d2c361e7147890be689f07883f5cfa92587020' 
  AND token = 'aol+VjMW/6qyTgc9+zQssEV32eGr5hekFOpdDC1o0MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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