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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da711160346c56b96262514d3e880514545763779245e0575f989dfb9de7a321' 
  AND token = 'J4msVsm0a1V/oBB1xdQg5h1enz7s/X3IkgeoXiQDSeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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