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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0edbd77b9c3ef97a53a444d75a9bad57cc039f1c7a260126a86dba8129b94d77' 
  AND token = 'QgNo93m6FaUzHDykNTt2Skfyo/9Pee+ihUWskkiUxTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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