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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9cc6a89100ffc1dce647e1c53eb09441b635436aafc56820cd7254be68bbe0b' 
  AND token = '5hxr41G63ot8fCNrsGRmwrugirnRjmJJNkfu5mVIt8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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