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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79e7171ff32c17c9902d265c6667c92e16a68b7329fbf6500d15b9186ef10ff0' 
  AND token = 'xTGokiHLrtGPv3+BRrh0XxJ8NLGlJ7o3IQkK0ZpVGd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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