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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90feeb741ca4d871f81ba5b159c1e455b5ce45a7e0cfda2e8d43ef86d718e1a2' 
  AND token = '5zbv/SK1xd/ZWraw6cgzUKTGtEy4TIQ/a7QYLmo+Sj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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