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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f673fcc6280d4e05d76e4b4c33277ad926f36a519a96182cf18c89eab1cc983' 
  AND token = 'O7Jpw6yKvRsnsKoekatASt7H0j1MFj3jx9Mcaph4vsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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