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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b936fb5d3598ca8f93311afac2699f72d0ae8f21055ec4cf71d5cc1720f8f1e5' 
  AND token = 'ctb172wSGupdHXuIM6De6yFvRjQVv5d3VIudSIsDWVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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