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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1003cc9ce7367ca88f1254a17043d0738befaad3bdef6bb8db9996683097431' 
  AND token = 'WWIOY8AjcawnMCM+2zTg+Ien9aQAXPd+ykJ2429PJYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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