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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55224c0bfd528d75b50c1ecd93e163e389e7248a0255c85aed34c58a695cca37' 
  AND token = 'vDefXAYVVYNALGFk2qCNsva2LvxCG+Qx5k1kca/c89c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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