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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98740ff647f9bf1b0466d6d4098946a6ba79ef179c21d012eeb1dd0c29deff54' 
  AND token = 'Giv7B3sxokv15JtmfeU426RuB3PM9YN5Xo4Pys/bwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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