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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9725f9694cd409fc49447fc43c888e8db84bc2c15e94d8bed9ed80c832e7073' 
  AND token = 'rkOH1/c3zaV7AF/0Y1DW1r6mniNpKUPAmaDWC5P25kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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