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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fe35dc671d751490a8ffb5af879c10d050f07deb26bf3a484d3bca1262e56e' 
  AND token = 'Upa1OBWJRp7Wk7MMQ6OFTeXfi5OwBoEqjyzcOKDWtKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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