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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48688af4c2edbc985227aec0ad90fdc72234c834b62f083e9d761a6b79c7ae05' 
  AND token = 'y8x3kuDr6qz8KJm9R6kdPuKqeUpOaCKOntt63U9bu8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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