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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab6ddad6ba1f0f77c0ccd88f8c756981eaa30bc86b7d01e5ce4906481bb982e' 
  AND token = 'FQpHgW92DryquUzCfIFQOCar5SXum4ZV0IAOy3JAQ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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