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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2ff3614c9e8239ec38e490c8b23273a63ec76e7350fbe8c1b99586ac8cd2f9a' 
  AND token = 'nS+1gzckAw7ZwRnd1dx9OLH6nUBwt7SOXuP0qyV0Z+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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