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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adce52757c05d5a01dba3caa3c0e93a81d151009c30007ca05df64c78d60b836' 
  AND token = '1p3CLYgW5pgxT/r6hjrHBbwEswUfkRr15shXtstLCdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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