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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba41c0ee5bceaa8dc1b8ebbd9887d27e7e79886bcbdc28eb52e32f19463f392b' 
  AND token = 'F7o0td0Z6cne9f3iqlcdxvVWT+JEhgc+Nx6KK9CFceM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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