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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca57d6fca37b43fe10796263ce23e349ae9778aa945bd2c7c0f3c5ed9ce13f2' 
  AND token = 'UfB2si4MZL//Yg1p+P1mmOJAkmSSa6cyw0q6dHakKUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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