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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c023f83d9d65352edcb9e2232c8ac9cb2150f287247da77911248dda444c8b2c' 
  AND token = 'ND/PruQ9dbc82Vc330G9wqPMpzGMFu3lZHFu9hiP//o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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