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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f384cd52b3ce7d839620523487358062f83c461538d37bc63e4ee0fa322ae05' 
  AND token = 'ejLaFFGwQ8sy5upYrW9OjIbet222YiMT8dUCYbrMWyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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