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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdc6ab43d8941c0576c2f2ac262aab3c8ae37d846365aa387c80e146d3f77e5' 
  AND token = 'keNcxdXzPPCSPxA0ylnd5Z6YGHwmdVsAJnO9undChEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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