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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eed148089168b23b6607dddd5043d8f955cb1fab12f2957790f65ea3d8860f9' 
  AND token = 'os3YYGdjch4tXvmOGPjaVMgTmkOiD8cfbpk2wacq188=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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