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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17125cc15d7da29f22eaf8c4b8a174764ff3cb7497ed7fd724fec2787222bc66' 
  AND token = 'j+p98RJJaNQAmCd4TzgteZHvyb8l3XLg2QZy6u5S9fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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