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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '617bbfc5585e12861b19e7e594d9a6f36115b615474b583450838b293b2f515d' 
  AND token = 'lalhXHN1cil1+upynTL+nA8J+BhfGtP5B6euvhXcxF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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