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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db255b5276aa3243cb386e37464a36cc34910a930c9e75861b9ad2d1a60327d5' 
  AND token = 'f3xsE80KkVO8tzP1k5KU/xKOsmq1grnDDRwSIqqkwUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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