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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0d6682bc0b81c4f6b116b464ae084d1b67e49eb300d6f9a97e39f1df33d83c3' 
  AND token = 'AIqTWs6xq/c1wG48PwoFgCb4hmToCynMQlTJMlozPNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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