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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672976a08402a0eec20620443294cf8c6715260fc1bbe9942d9456003ce91bb5' 
  AND token = 'JyRhr797cXFm2tKhaT9Z/xXWZE2PcVSu68rLfYwu5LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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