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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db30d072b9b66effe98fa91ad4450b00343320d2fe904d6fadbfe2d46a009cde' 
  AND token = 't8UQd5zeGseopOzURZ11aCUJGVVeXy4c8/Hf12M3QAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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