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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '285079aa33cd6ad8f906372a5e45134d49d8735e206c5b5abedf5060486c8c09' 
  AND token = 'LZp8w+AQTWXAsUbp8uUI1Ru1jeanet9fUXZdevBAqwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00081

JSON explain

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