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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c098e7e4d228ad2ed0a69dab475b3dc38b0d9c1f3474c28d6ed4ca65516e611' 
  AND token = 'jag1GOUBeRSrPbjkjUks5Hs5EFnyUAt817UJQkmKClM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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