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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64327ce16a6ec45dc81fd02ece8f2d2edafce428d3f34a812ea01c584f803241' 
  AND token = 'UbJLKJ+FUOIMPTp+juuxTNt7JhCY7oDij9k4j6doB9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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