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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1a525429e22f7aa88182bb9dbd022e19da8d74cfba170fd5982dd3cbdea40c9' 
  AND token = '0NtOpaybo9nj7mHqIjpMHo5ZwJgCtfUt6qeAqUDxgFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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