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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f72d8ffe2b2a219b4c13ebd6b63bf5c6f9b55f1bae1daf7ca7d0e1f0118121a5' 
  AND token = 'AijlhhCuFj6Q+lAQsoskyByTiF1HGjw8CUc6S5nugi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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