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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5ee57733712deceae2e5f4ccdf832cd2d3dabe1ce10908de2cdfe8bc2f335c' 
  AND token = 'Z3+ZmwlZY9O4jDywdtabrWBvCz+H0G1sZSGOUe/U8n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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