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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1341ae8518fb52244920b5a7b1fe20481206fff2ce182a8e8d10e770cf0a461' 
  AND token = '7RDr4BcuUcYsnp5Kf7upVU5LQQQRMezy6PJ0WoXWNIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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