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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12769e4734f8aa9bf94e002e43717e6d1083ec3a6a5229d84fe25642bf324d21' 
  AND token = '7GxER9Kn7iNIgbHzK6RaL+0zO8AZ/JobJD14MRlF2Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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