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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '056e1ea19be48b33ab44075eb41ca2fafae787f52a5cadc7c546729d5f9f5dca' 
  AND token = 'mxLeixLX9TL3ObP5E/dqGMeYZ5I+kcrPm8QifLruWLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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