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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d929a7e6b192b00986b49341907a4fcc027630bc99029977def131fa926a86c' 
  AND token = 'bBoN74fut51dOPnB5jNeQ2nz26ve/BNWENxh3zk/FWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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