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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea4e38528950adb9e97bede81306346edecd57ffecefc7814c92d83890acb74' 
  AND token = 'Ob9Ci3kNrzvKTX9GNca0nIe2n6VPBrlSMlrS450KfNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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