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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deaca1a1ca92b2c4d3bae7431280aaaf84384cc2277470c050770a33e7381388' 
  AND token = 'JSkWq2mASzKXKNZiV84Iuo36XecpViEkB7lB4RvG/5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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