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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b1e993156fbb44e3f14b9d55fbffcd5dd5f404acce9e4be851a83bf45d9ac4b' 
  AND token = 'f9Bn9bc6GepQVI4lLLO4Ev25GHAfhn3uaa2wMa2Xzpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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