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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '392b72a05b3750981ed1127e1288ce917740eb9eb7d7c00c3622ae70f3941aba' 
  AND token = 'zgnjfOXMyu+11u+Twk+XP65iiKux820p+fl2+U6xmfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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