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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360eaa98eaf324f3d0d210af058452d7fdd83518e803f9bb62ee119c9f1241c0' 
  AND token = 'NyiObJMwOHMS3u/IpvSyJJ+DShgH1NQm/hoqH4CKR5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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