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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '241494446d3d0f37ed420925066ca13dddedbdfb06700df148f47decb7a4980a' 
  AND token = 'FXFq1FR4cq8UawkdcclyIq1xVus4nDs/VDDSxGISHPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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